> From: Christian Hack > I still stand by my statement. Does the windows version capture full motion > on all 4 channels. The only simultaneous capture cards I have seen have a > different capture chip or have more than one capture chip fitted. > > Feel free to prove me wrong though. ;-) > > CH I've spoken with Gerd about this previously. The only way todo this with the current linux bttv driver, is to switch inputs (very slowly). Generally, this means, grab 1 frame, switch and skip 5 frames (waiting for the video device to settle down). This gives a realistic throughput of about 2 fps switching between 2 inputs. This is totally unacceptable for a surveillance solution. There is some trickery going on in the windows driver, because the exact same card with the windows driver can capture around 10-15fps across 2 inputs. There is some documentation on the linux driver page for the Matrox Meteor2. I know this is a different chipset, but they mention things like saving the white balance before the switch, and then restoring it after the switch. Things like that to help speed up syncing the video after a switch of the input. I believe this is called Fast Input Switching. However, I can't find anything on the net about how to do this with the bttv driver. Ryan
